Hy!
I have used g.region and g.proj for showing the projection information of my
data set.
When using g.region, the current UTM zone is 0, while when using g.proj the
UTM zone is 15. Beside, UTM zone 15 is the right one (see the picture below
- sry for the bad quality)
http://osgeo-org.1803224.n2.nabble.com/file/n6167098/both.png
So why there are different outputs between this two modules or do I
interpret something wrong?
Cheers Tim
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On Sun, 13 Mar 2011, TimNorwey wrote:
Hy!
I have used g.region and g.proj for showing the projection information of my
data set.
When using g.region, the current UTM zone is 0, while when using g.proj the
UTM zone is 15. Beside, UTM zone 15 is the right one (see the picture below
- sry for the bad quality)
http://osgeo-org.1803224.n2.nabble.com/file/n6167098/both.png
So why there are different outputs between this two modules or do I
interpret something wrong?
When GRASS was originally created in the early 1980s the only co-ordinate system it supported was UTM, thus the zone was the only projection parameter that needed to be stored and it was kept alongside the region information in the region file. This field is still there for backwards compatibility but an additional copy of the zone is stored as part of the projection information, and this is what is actually used in any modules or import/export procedures that require knowledge of the projection. Thus it won't be a problem that the zone in the region information is incorrect (it would be a problem if the zone in the projection information was incorrect). They should normally be kept in sync though and I'm not sure why they wouldn't be. If you can remember how the location was originally created it might shed some light on it.
Paul
good to know
thank you
cheers tim
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